Python Phrasebook.pdf

Python

PHRASEBOOK

ESSENTIAL CODE AND COMMANDS

Brad Dayley

DEVELOPER’S

LIBRARY

Sams Publishing, 800 East 96th Street, Indianapolis, Indiana 46240 USA

Python Phrasebook

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to the use of the information contained herein. Although every precaution has been taken

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International Standard Book Number: 0-672-32910-7

Library of Congress Catalog Card Number: 2006922308

Printed in the United States of America

First Printing: November 2006

9 8 7 6

4321

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Acquisitions Editors

Jenny Watson

Mark Taber

Development Editor

Songlin Qiu

Managing Editor

Patrick Kanouse

Project Editor

Tonya Simpson

Copy Editor

Sarah Kearns

Indexer

Heather McNeil

Proofreader

Mike Henry

Technical Editor

Tim Boronczyk

Publishing

Coordinator

Vanessa Evans

Book Designer

Gary Adair

Page Layout

TnT Design, Inc.

Table of Contents

Introduction

1 Understanding Python

Why Use Python?

Invoking the Interpreter

Built-In Types

Understanding Python Syntax

Python Objects, Modules, Classes,

and Functions

Error Handling

Using System Tools

2 Manipulating Strings

Comparing Strings

Joining Strings

Splitting Strings

Searching Strings for Substrings

Search and Replace in Strings

Searching Strings for Specific

Endings/Beginnings

Trimming Strings

Aligning/Formatting Strings

Executing Code Inside Strings

Interpolating Variables Inside Strings

Converting Unicode to Local Strings

3 Managing Data Types

Defining a List

Accessing a List

Slicing a List

Adding and Removing Items in a List

Contents

Sorting a List

Using Tuples

Constructing a Dictionary

Adding a Value to a Dictionary

Retrieving a Value from a Dictionary

Slicing a Dictionary

Swapping Keys for Values in a Dictionary

4 Managing Files 77

Opening and Closing Files 77

Reading an Entire File 80

Reading a Single Line from a File 82

Accessing Each Word in a File 83

Writing a File 84

Determining the Number of Lines in a File 86

Walking the Directory Tree 87

Renaming Files 88

Recursively Deleting Files and Subdirectories 90

Searching for Files Based on Extension

Creating a TAR File

Extracting a File from a TAR File

Adding Files to a ZIP File

Retrieving Files from a ZIP File

100

5 Managing Threads 103

Starting a New Thread 104

Creating and Exiting Threads 106

Synchronizing Threads 108

Implementing a Multithreaded Priority Queue 110

Initiating a Timer-Interrupted Thread

113

6 Managing Databases

117

Adding Entries to a DBM File

118

Retrieving Entries from a DBM File

120

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